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| Study and Application on Q800D/E Grade Construction Machinery Steel Produced by Direct Quenching Technique |
| YU Wei1，LIU Li-hua2，WU Hui-bin1，HUO Song-bo2，HONG Guang-tao2 |
1. Metallurgical Engineering Institute, University of Science and Technology Beijing, Beijing 100083, China
2. Research and Development Center, Nanjing Iron and Steel Company Ltd.， Nanjing 210035, Jiangsu, China |
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Abstract Using high density laminar cooling device of steckel mill, low carbon Mn-Mo-Nb-Cr-Ni series Q800D/E grade construction machinery steel was produced by direct quenching and off-line tempering technique. The yield strength of the plate was more than 800MPa and the CVN impact energy at - 40℃ was more than 100J after appropriate tempering. During tempering temperature rising, the precipitates in Q800D/E exhibited growing, re-nucleating and coarsing process, which would lead to the fluctuation of the plate strength.
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Received: 29 September 2010
Published: 15 December 2011
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2011, Vol. 46 
